Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c91a581eba3bb46…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 21:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 127478c9b05032f05859ec996963ae56 SHA-1: 0d146929cd40602ca80ad6598ae88894c3754667 SHA-256: 1c91a581eba3bb4631611442e16de2b2cac59860c5c8c3e694bc598f49cb7cd2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=issues+with+android+today PDF link annotation
    • http://form4concrete.ru/pics/cont/file/nediwigitilibuluketu.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/zotinukile.pdfIn PDF document text
    • http://ty-int.com/files/files/pedazi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9392098f3622b3de509a68db17a1b6b8/34348106053.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vks6295ojkrn2k0vbp3qcpvfp7/84835964342.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/gevofenufake.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/75981955885.pdfIn PDF document text
    • https://777mto.info/contents/files/83790439768.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/92374239832.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/92382057477.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/19036853292.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/xesapozesu.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/45276488989.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/metegofopagunoxazubarugak.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/vukirujavaxik.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/64497672465.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210901225312683877dcfc3onwizgs.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9fcb437f---4933359187.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/4699956802.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/getekizutalarowejov.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/98588953987.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 10552 bytes
SHA-256: be8c1ef21ca8069923594320d071f32f48b0891d59e07b7d6027dccfd36a5095
font_01_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 17840 bytes
SHA-256: a88021fca6bcb3c5049903c3a55bd319b14e58887198d326e9cbcb6b874e6f95
font_02_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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